Yup.
Super Sonic is too good.
The only issue, however, is that sometimes, when you go to press B immediately, a Homing Attack will come out, which can put you in a bad position to get the Final Smash knocked out of you, so what I usually do is upB, then mash B. no one will be up there to knock it out, and I'm going Super Sonic all over their face. Of course, if you do that, you have to make sure that you stay on the stage, otherwise you will fall to your doom.
Other really good Final Smashes include All Landmasters, Yoshi Dragon, Ganon Pig, Marth's Critical Hit, and Pit's Gay Fairies.
Of course, they all mean nothing if you can do MetaKnight's invisible glitch... one time, I was in a critical match against a Sonic, he went Super, and I had to do the glitch perfectly in order to live. I did it, and I won the match.
But ultimately, MK going invisible forever is the only real way to beat Super Sonic.